function displayLocation(location){
	// hide all image divs
	hideAll();
	// display the appropriate div
	document.getElementById(location).style.display = "block";	
}
function hideAll() {
	// hide all image divs
	document.getElementById('rutherford').style.display = "none";		
}
function initialize() {
	// hide all image divs except the initial one
	document.getElementById('rutherford').style.display = "block";
}
window.onload = initialize;